A tankless water heater typically costs $2,500-$6,500 installed, with an average project near $4,500. The final price depends on fuel type, household demand, venting, gas-line or electrical upgrades, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed gas unit | $2,500 | $4,500 | $8,000 | Higher end may include gas-line or vent changes |
| Installed electric unit | $1,500 | $3,000 | $5,000 | Electrical capacity can raise the quote |
| Equipment only | $300 | $1,200 | $2,500 | Price varies by fuel and capacity |
| Annual flushing service | $100 | $175 | $300 | May cost more in hard-water areas |
Installed tankless water heater prices by fuel type
For a standard home replacing a conventional tank with a comparable-capacity unit, expect $2,500-$6,500 for a complete installation. A straightforward electric replacement can fall below that range, while a high-capacity gas system requiring new venting or a larger gas supply can exceed it.
Equipment alone commonly runs $500-$2,000 for a gas model and $300-$1,000 for an electric model. Premium condensing gas units and larger systems may cost $2,500 or more before labor. Most of the difference between a low and high quote comes from installation changes, not just the heater itself.
Assumptions: One residential unit, standard access, ordinary installation, and no major structural repair.
What gas-line, vent, and labor charges add
Quotes combine the heater, installation labor, venting or electrical work, and any removal or permit fees. The table shows typical U.S. ranges; separate charges may be bundled into a contractor’s total.
| Quote component | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| Heater equipment | $300-$2,500 | Per unit | Fuel, brand, capacity, efficiency |
| Plumbing installation | $700-$1,800 | Per job | Pipe rerouting and access |
| Gas line or electrical work | $300-$2,000 | Per job | Supply size and panel capacity |
| Venting and intake | $300-$1,200 | Per installation | Route length and wall or roof exit |
| Removal, permits, disposal | $100-$600 | Per job | Local rules and old tank handling |
Labor often accounts for $800-$2,000, depending on complexity and crew time. A basic swap may take 4-8 hours; a conversion with new venting, piping, and electrical work can take a full day or longer. Ask for labor, equipment, permit, and upgrade charges to be listed separately.
How flow rate and fuel supply change the quote
Tankless units are sized by flow rate, measured in gallons per minute (GPM), and by how much they must raise incoming water temperature. A 5-7 GPM unit may suit a smaller household with limited simultaneous hot-water use; a home needing 8-11 GPM can require a larger or multiple-unit setup.
Gas models may need a ¾-inch gas line or a longer, higher-capacity run if the existing supply is undersized. Electric models may require a 200-amp service panel and dedicated circuits; panel upgrades can add $1,500-$4,000 or more. Hard water can also require a scale-control device, often $150-$500 installed. Confirm both the required GPM and available gas or electrical capacity before comparing equipment prices.
Regional labor rates shift installed prices
Labor and permitting make the same equipment cost different amounts across the country. Major coastal metros and high-cost cities may run 15%-30% above a national-style estimate, while some rural and lower-cost markets may be 10%-20% below it. These are broad comparisons, not guaranteed local prices.
Demand, contractor availability, travel distance, and local code requirements affect the spread. In remote areas, service-call minimums or travel fees may add $75-$250. Urban quotes can be higher because of labor rates, parking, access restrictions, or stricter inspection requirements. Use local written quotes for budgeting; online equipment prices do not include regional installation costs.
Removal, permits, and extra work to check
Replacing a tank heater may require disconnecting and hauling away the old unit, commonly $100-$300. A permit and inspection can add roughly $50-$300, depending on the jurisdiction. Some contractors include these charges in a package price, so the estimate should say whether they are included.
Other possible extras include condensate drainage for a condensing gas heater, a new exterior vent termination, water shutoff valves, or wall repair. Each can add $100-$600 or more. If the installation location is difficult to reach, labor may rise; rerouting long water or vent lines can add several hundred dollars. Request a site visit when the quote depends on concealed piping, panel capacity, or vent routing.
Three installation quotes with different scopes
A direct gas replacement in a home with adequate piping and vent access might include a $1,200 heater, $1,100 labor, $500 vent and fittings, and $200 removal and permit charges, totaling about $3,000. This assumes no gas-line resizing or wall repair.
A typical electric installation could total around $3,400: $800 for the unit, $1,200 for plumbing and labor, $1,000 for circuit work, and $400 for permit and related materials. That price assumes the panel can support the new load without a service upgrade.
A larger gas conversion with a new line, vent route, and premium unit might reach $6,800: $2,000 equipment, $1,600 labor, $1,400 gas and vent work, and $1,800 for permits, removal, and related upgrades. Compare quotes only when capacity, included upgrades, warranty, and disposal scope match.
Ways to lower the tankless installation bill
Keep the project within the existing location when possible, since moving the unit can require new water lines, gas piping, wiring, or venting. Choose capacity based on simultaneous demand rather than buying the largest model by default. A qualified installer can calculate the required flow and temperature rise.
Get at least three itemized bids and check whether each includes permits, removal, vent materials, startup, and warranty service. Scheduling during a contractor’s slower season may improve availability, though savings are not guaranteed. Avoid paying for a panel upgrade or gas-line replacement until a professional confirms it is required. A repair may cost less than replacement when the existing unit is relatively new and the fault is limited to a replaceable component.